石家庄学院学报

以调查宿州市土壤的重金属污染状况数据为基础,按照有关标准和方法,对宿州市土壤重金属潜在生态风险进行了评价.结果表明:宿州市土壤中Cu,Zn,Cr,Cd,Hg,Pb,As 7种重金属含量都存在着一定幅度的变化,矿区土壤单因子污染指数Hg,Cr为重度污染、Cd,As轻度污染水平,耕地除Hg,Cr有部分超标外,其他重金属含量均达标;28.57%的土壤属于安全等级,32.86%的土壤属于警戒线,7.14%的土壤属于轻污染,2.86%的土壤属于中污染,28.57%的土壤属于重污染;67.14%的土壤属于低风险等级,5.71%的土壤属于中等风险等级,强风险等级土壤占15.72%,很强风险等级土壤占11.43%,而属于强风险、很强风险等级土壤都是矿区土壤,耕地均属于低风险等级;土壤中7种重金属对污染的贡献大小顺序为:Hg>Cr>Cd>As>Cu>Zn>Pb.

The potential ecological risk of heavy metals in soil was evaluated based on the related standards and methods and the investigation of heavy metal pollution status in soil of Suzhou.The results show that the changes in content of Cu,Zn,Cr,Cd,Hg,Pb,as in soil of Suzhou were found.Mine soil single factor pollution index of Hg and Cr reached a high level of pollution while that of Cd stayed at a low level.The heavy metal content in paddy land reached the standard except the content of Hg and Cr.28.75% of soil belonged to safe grade,32.86% of soil reached the warning line,7.14% of soil reached the slight pollution level,2.86% of soil reached the moderate pollution level,and 28.57% of soil was heavy pollution area.67.14% of soil in Suzhou was at the low risk level of potential ecological risk index,5.71% of soil was at the middle risk level,15.72% of soil was at the strong risk level,and 11.43% of soil was at very strong level.Mine soil was all at the strong risk and very strong risk while paddy land was at low risk level.The contribution to pollution of heavy metals in soil was in an order of Hg> Cr> Cd> As> Cu> Zn> Pb.